Lifting-jack.



F. L. GORMLEY.

LIFTING JACK.

APPLICATION FILED FEB. 21. 1918.

l ,287,966., Patented Dec. 17, 191 8.

2 SHEETS-SHEET 2.

65 %ML Gormley,

FRANK L. GORMLEY, OF BROOKLINE, MASSACHUSETTS.

LIFTING-JACK.

matese.

Specification of Letters Patent.

Patented Dec. '17, 1918.

Application filed February 21, 1918. Serial No. 218303.

To all 'whom z't may concm:

Be it known that I, FRANK L. GORMLEY,-

The invention consists in providing the Operating gear spindle withlocking means 'which will permt the gearto be rotated in one directionto raise the movable member but will prevent accidental rotation of sadgear in the reverse direction, said' looking member having associatedtherewith a man-;

uallyoperated lever for controlling the action 'of said looking means.

The invention further consists of certain novel features of constructionand arrangement of parts which will be more fully un derstood byreference to the description of the drawings and to the claims to behereinafter given.

For the purpose of illustrating the invention one preferred form thereofis illustrated in the drawings, this form having been found to givesatisfactory and reliable results, although it is to be understood that,

the various instrumentalities of which the inventon consists can bevarously arranged and organized and that the nventon is not limited tothe precise arraigement and organization of these instrumntalities asherein shown and described, except as required bv the sco e of theappended claims.

Of the raw'ings:

Figure 1 represents a horizontal section of a lifting jack embodying thefeatures of the present invention, the cutting plane being on line 1, 1o'n Fig. 2.

Fg. 2 represents a vertical section of the same, on line 2, .2 oi Fig.1.

Fi'g. 3 represents a vertical section on lne 3, 3 on Fig. 2, drawn to anenlarged scale, and

Fig. 4 represents a horizontal section on line 4, 4 on Fig. 2.

Similar reference characters desi'gnate like parts throughout theseveral figures of the drawings.

In the drawings, 10 represents a suitable base supporting a stationarystandard 11, over the outer periphery of which is fitted a movablesleeve' 12, to the upper end of which is threaded a cap 13.

In the upper end of the standard 11 is mounted a 'nut 14 to which isthreaded a lifting screw'l having splned to its upper reduced end abevel gear 16 with which meshes a bevel gear 17 formed upon or securedto a revoluble shaft or spindle 18, the outer endof which is providedwith a ,suitable Operating' mechanism 19 -of any well knownConstruction.

Between the upper face of the bevel gear 16 and the inner face of thecap 13 are two v annular plates 20, 21, between which are interposed aplurality of` anti-friction members 22.

The movable member 12 is provided on oneside with a flanged projection24 having a removable plate 25 secured thereto by bolts 26.

The plate 25 is provided with a bearing 27 for the spindle 18, and keyedto said spindle 18 between said inner end of said bearing 27 and therear face of the bevel gear 17 is a worm gear 28 rotatable in eitherdirection with the bevel gear 17.

The worm gear 28 meshes with a worm 29 formed upon or secured to a shaft30 revolubly mounted in ears 31, 32 projecting inwardly from the plate25.

On one end of the shaft 30 and adjacent to the ear 32 are two collars33, 34between which are interposed a plurality of antifriction members35, said collars 33, 34 being retai'ned together by a rng 36 secured tothe collar 33 and havng an annular flarge 37 extendingover the outerface of the collar 34. The collars 33, 34: with the anti-frictionmembers35 form a thrust bearing for the shaft 30 on which the sad thrst hearingis retained by a nut 38 threaded to the reduced end 39 of said shaft.

Loosely mounted on the opposite end of the shaft 30 is a spur gear 40having a ta pered annular fiange 41 with which coacts a disk 42 keyed tothe shaft 30 and having a cone-shaped periphery adapted to contact withthe tapered 'fiange 41 of the gear 40.

The disk 42 is retained upon the reduced end 43 of the shaft 30 by meansof the ntt 44 threaded to said reduced end. When the movable member 12is being raised the worm gear will be rotated in the direction of thearrow a on Fig. 3 of the drawings and the disk 42 will be separated fromthe ange 41 and no rotation will be imparted to the spur gear 40.

When a load is on the cap 13 tending to lower the member 12 the tendencywould be to rotate the worm gear 28 in a direction opposite to thatindicated by the arrow a and the worm shaft 30 would be moved endwise,toward the right of Fig. 3, until the cone-shaped periphery of the disk42 has been brought into' firm contact with the tapered ange 41 on thegear 40.

t is obvious that under these conditions any rotary movement imparted tothe shaft 30 will be imparted to said gear and through it to the pinion45 with which its teeth are constantly in mesh.

The pinion 45 is forned upon or Secured to one end of a short shaft 46revolubly mounted in a hearing 47 formed upon the plate 25, said shaft46 being provided at its end with a reduced portion 48 to which is keyeda brake disk 49 having a cone-shaped periphery.

The plate 25 .is provided with another hearing 50 in axial alinementwith the bearing 47 and in this hearing 50 is slidably mounted the shank51 of a disk 52 having a fiange 53 the inner wall of which is tapered tofit the cone-shaped periphery of the disk 49.

he iange 53 of the disk 52 is normally held in contact with theperiphery of the disk 49 by means of the spring 54 and said disk 52 isprevented froni rotating by means of thepins 55 eXtending therefrom intoopenings 56 in a ange 57 forming a part of the hearing 50.

lChis hearing 50 is provided with two diametrically disposed Slots 59 inits periphery and in these slots 59 are positioned the cylindrical hubs60 of a bifurcated lever 61 having cam surtaces 62 hearing againsttheinner face of the collar 58.

The lever 61 is provided with an arm 63 projecting through an opening 64in the plate 25 the outer end of which is accessible to the operator whomay with his fingers move the arm 63 in the direction of the arrow 5 andthus disengage the brake members 49, 53 and thereby permit the member 12to be lowered.

As long as these brake members 49, 53 are in contact the worm 29 will beprevented :trom rotating and as a consequence, there can be no downwardmovement of the member 12,

The rapidity of the lowering of the member 12 may be controlled readiiyby the movement oi' the iever 61. i

The pitch of the threads of the 29' is naeaeeesuch that said worm may berotated by the rotation of the worm gear 28.

'in the operation of the jack the worm gear 28 is revolved in thedirection of the arrow a when raisin movement e? said gear 28 it willthrough the slight end movement imparted to the worm 29 disengage themembers 41, 42 so that there will be no brake devices or friction to retard the rotation of the gear 28.

`When, under the load, the gear 28 begins to rotate in the oppostedirection, the worm 29 will be moved endwise until the members 41, 42are engaged and then rotary movement will be imparted from the shaft 30to the short shaft 46 through the gears 40-45 At this time the brakemembers 49, 53 will be disengaged, said disengagement having been efiected by the lever 61.

When, on account of an excessive load upon the ca-p 13, the member 12moves downwardly too rapidly, its movement may be arrested by simplymoving the lever 61 to bring the members 49- 5?) into frictionalcontact.

This makes a very simple mechanism for controlling the lowering of thejack and it is believed that its operation and the many advantages ofthe invention will be readiiy understood without further description.

One advantage of the present invention is that it dispenses with the useof all pawls and ratchets which are ordinarily used in jacks or" thischaracter.

Having thus described my claim: V a

1. 'Jin a lifting jack, the combination of a revoluble Operating shatt;a worm gear secured on said shaft and positively rotated thereby ineither direction; a worm meshing therewith and adapted to be rotatedthereby: and means for retarding the rotary movement of said worm 'andvarying the speed ot rotation thereof.

2. tn a lifting jack, the combination ot" a revoluble Operating shatt: aworm gear keyed to said Operating shaft and positively rotated therebyin either direction; a worm meshing therewith and adapted to be rotatedthereby; a brake mechanism; means actuated by the rotation of said wormfor piacing said brake in action during the lowering operation; andmeans for controlling the operation of said breke mechanism.

3. In a litting jack, the combination of a revoluble Operating shatt: aworm gear keyed thereto and positively rotated thereby in eitherdirection: a worm meshing therewith and adapted to be rotated thereby: abrake mechanism; means actuated by the rotation of said worm forplacingsaid brake in action during the iowering operation; and manualiyactuated means for controlling the operation of said breke mechanism.

e in ii'ting jack,

the load and' at the initialinvention, l

the combination ot' a revoluble Operating shaft; a worm gear keyedthereto and positively rotated thereby in either direction; a wormmeshing I therewith and adapted to be rotatecl thereby .ing operationand thcreby actu'ate said brake mechanism; and means for controlling theoperation of said brake mechanism'.

5. In a lifting jack, the combination of a revoluble Operating shaft; aworm gear keyed to said- Operating shaft and positively rotated therebyin either direction; a worm meshing therewith 'and adapted to berotatedthereby; a brake mecha'nism; means. includinga rotatable member ada tedto be placed in action by said worm durng the lowering operation andthereby actuate said breke mechanism; and a cam member :for controllngthe operaton of sad brake mechan'sm;

6. In a lift-,ing jack, the combination of a revoluble Operating shaft;a worm gear keyed to said Operating shaft and positivel rotated'therebyin either direction; a -sli able x worm. meshing therewith and adaptedto be rotated thereby; abrake mechanism independent of the slidable wormbut actuated by the rotation thereof; means actuated by the slidingmovement of said worm for placing said 'brake in actionduringthelowering operation; and means for controlling the operation 'ofsaid brake mechanism.

7. In a liftng jackthe combination of a.

revoluble Operating s aft member; a movable member thereon; a revolublemember for raising said movable member; means for rotating saidrevolub'le memberincluding a laterally extendin' Operating shat; a wormgear keyed to sai Operating shaft; a worm meshing with and adapted toberetated by said worm gear and'having end movement; a gear looselymounted on the worm shaft; a member Secured to said shaft adapted to bemoved with said shaft into driving engagement with said gear; arotatable brake member; a driving pihion therefor 'meshing with saidgear; and a non-revoluble brake member coacting 'withsaid rotatablebrake member.

8. In a lifting ack, the combination of a revoluble Operating shelf; aworm gear keyed to said Operating shaft;-aworm meshing with and adapted'to be rotated by said worm gear and having end movement; a

gear loosely mounted on the worm shaft; a

member Secured to said shaft adapted to be moved with said shaft intodriving engagement with said gear; a rotatable breke member; a drivingpinon therefor meshing with said gear;`a non-revoiuble breke memvrevoluble Operating shat; a worm gear revoluble Operating shaft; a 'wormkeyed thereto and positively rotated thereber coacting with saidrotatable breke member; a spring for normally retaieing said brakemembers in engagement; and manually actuated means for disengaging saidmembers.

9. In a liftng jack, the combination of a -evoluble .Operating shaft; aworm gear keyed to said Operating shaft; a worm meshing with and adaptedto be rotated 'by ,said worm gear and having end movement;

10. In a lifting jack, the combination of a 35 keyed thereto andpositively rotated thereby in either direction; a slidable and rotatableworm meshing with said worm gear;

a breke mechanism independent of but adapted to be actuated by therotaton ef 'said worm; and means for placing said brake meehanism in andout of action by the sliding movement of said worm in oppositedirections.

' 11. In a liftin'g jack, the combination of a gear by in eitherdirection; a slidable and rotatable worm meshing with said worm gear; abrake mechanism independent of but adapted to be actuated bythe rotationof said worm; means for placing said breke meeha'- nism in and out ofaction by the sliding movement of said worm in opposite directions; andmanually operated means for regulating said breke meehanism when 'inaction.

12. z a lifting jack, the eombination ofa revoluble Operating shaft'; aworm 'gear keyed'thereto and positiveiyr otated therene by in eitherdirection; a shdable and rotatable worm meshing with said worm gear; abreke disk; means for rotating Saiti disk by the ,rotation of said. wormduring the v lowering of the load; and' e non-revolible member underthecontrol of the operator adapted .to ceaet with said ;disk to prevent theoad being lowered too rapidly.

Signedby me at 4 Post Ooe Square, Beston, Mase., this 20th day of FRA L.GORMLEY; Witne es:

Februarv. 1918.

